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A few days ago I have successfully passed 642-902 exam (CCNP ROUTE v6) and would like to share the list of materials I have been using to prepare to that exam. To get prepared I was using official Cisco Press training re... →

There is Cisco router of 7200 series with 4 FastEthernet interfaces (FE) and 2 serial ports. It should act as load balancer and failover for LAN connected to it via one FE 1/0 interface while two identical Internet conne... →

Using nfsen it is possible to view IP traffic statistics on Linux interfaces including the graphs showing data sent and received (see the screenshot to the right) as well as historical information about all data transfer... →

By default an average Linux distribution allows applications to use the following TCP port range for outgoing connections: 32,786-65,536. That's why your system can handle up to 28,232 TCP sessions at time. Notice, this ... →

Today I'd like to describe setup of sendmail that allows to establish receiving of e-mails for certain domain and sort incoming messages between virtual users. Those users must be able to fetch received e-mails via POP3 ... →

It was long time ago when I wrote here last time but today I'd like to share the link to an application that would be appreciated by everyone starting from Linux starter wishing to speed up his/her Internet connection an... →

As we know Linux allows to assign almost unlimited number of IP addresses to its interfaces. Such additional IPs applied to the same NIC are known as secondary IP addresses or just secondaries. Some time ago i faced a pr... →

By default Cisco IOS doesn't provide any traffic monitoring tools like iftop or iptraff available in Linux. While there are lots of proprietary solutions for this purpose including Cisco Netflow Collection, you are free ... →

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Who’s behind LinuxScew?

My name is Artem Nosulchik, I'm part time blogger and full-time Linux sysadmin. In 2007 I started LinuxScrew to share my personal notes on anything related to Linux and Open Source on the whole and found this pretty interesting.